Can't Connect to SQL*Plus using SID - sql

Question

I executed the following query to find the SID of the database that I was connected to as system:
SQL> select sys_context('userenv','instance_name') from dual;
SYS_CONTEXT('USERENV','INSTANCE_NAME')
--------------------------------------------------------------
orcl
I then try connecting to system with the following command:
C:\>sqlplus system/system#orcl
SQL*Plus: Release 12.2.0.1.0 Production on Wed Aug 8 23:53:02 2018
Copyright (c) 1982, 2016, Oracle. All rights reserved.
ERROR:
ORA-12154: TNS:could not resolve the connect identifier specified
What can I do to connect to the database as system while specifying the SID?

Answer 1

Using a SID, you say? Expand the connect string a little bit. Here's how:
I'll use TNSPING to find information I need:
M:\>tnsping orcl
TNS Ping Utility for 64-bit Windows: Version 11.2.0.1.0 - Production on 09-KOL-2018 07:13:18
Copyright (c) 1997, 2010, Oracle. All rights reserved.
Used parameter files:
C:\0_Oracle_library\sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION= (ADDRESS= (PROTOCOL=TCP) (HOST=db_kc11g) (PORT=1521)) (CONNECT_DATA= (SID=kc11g)))
OK (20 msec)
Now, connect:
M:\>sqlplus scott/tiger#(description=(address=(protocol=tcp)(host=db_kc11g)(port=1521))(connect_data=(sid=kc11g)))
SQL*Plus: Release 11.2.0.1.0 Production on ╚et Kol 9 07:14:05 2018
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options
SQL>
Or, shorter:
M:\>sqlplus scott/tiger#db_kc11g:1521/kc11g
SQL*Plus: Release 11.2.0.1.0 Production on ╚et Kol 9 07:16:59 2018
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options
SQL>